Plowdisk-shafvpening- machiwe



Maytag, 1923. V (Z. T. GWVIE PLOWDISK SHARPENING MACIUINE Filed March 20. 1922 lmvmfim W:

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Patented May 29, 1923.

PATENT ortica.

CARL T. GROVE, GIE' GREAT FALLS, MNILNA.

PLOWDISK--SHARPENING lVIACHINE..

Application filed March Z0, 1922.

To all who/m t may concern.'

Be it known that I, CARL T. GROVE, a citizen of the United States, residing at Great Fails, in the county of Cascade and State of irtontana, have invented a new and useful iiowdisleSharpening lVlachine, of which the following is a specification.

My invention relates to improvements in disk sharpening machines which are operated .in conjunction with a rotary grinding wheel; and the objects of my invention are; first, to provide a machine on which plow disks maybe placed and sharpened in a relatively short time; second, to afford facilities by means of suitable adjusting blocks 'which assure the disk being held at the proper angle for correctly beveling the edge; and third, to provide suitable guards to prewent the disk from being ground too deeply in any one place. i

I attain the objects by the mechanism illustrated in the accompanying drawing, in which- Figure 1 is a side View of the entire machine in a vertical position; Fig. 2, an end view of the machine in a vertical position; Fig. 3, a detailed view in perspective of the lupper block 1; Fig. 11, an enlarged View of the ratchet plate which is a part of the upper block 1; Fig. 5, a view of the upper side of the middle block 5; Figs. 6 and 7, larger views of the pinion shown in Fig. 5; and Fig. 8, a View in perspective of the guide bracket 13.

Similar numerals refer to similar parts throughout the several views.

'[n Figure 1 there are shown a grinding wheel and carrier 23 and a plow-disk 24;. do not wish to be limited to any particular type of grinding wheel, as any suitable grinding wheel properly fastened will serve the purpose. Parts 23 and 24 are therefore not claimed as part of my invention.

The device consists of three adjustable blocks, 1, 5, and 8, of which 8 is fastened to a base plank 10 by means of a hinge 9. These blocks 1, 5 and 8 are arranged in a slotted guide bracket 13 (Fig. 8) as shown in the accompanying drawing (Figs. 1 and 2). Block 8 is elevated or lowered to the desired position and firmly fastened in such position by means of a thrubolt which passes through block 8 and the slots in 13, by tightening the Wingnut 14E.

Block 5 is pivotally fastened to the upper Serial No. 5115,373.

side of block 8 by mean of a metal strap 11, firmly bolted to block 8 by thrubolts 12, 12, so that block 5 may be inclined to the desired pitch by being turned on the metal pivot 7. Such tilting of block 5 is accomplished by means of the crank shaft or rod (i which passes through block 5 and is firmly fastened to block 5 by n'ieans of a washer E and a taper pin 26 on the upper and the under side of block 5 as shown on the draw ing (Fig. 1). The crank shaft 6 passes on down through block 8 and through the nut 15, which nut is countersunk on the under side of block 8 and is held in place by the metal plate 16. i

Block 1 is slidably fastened to the upper side of block 5 by means of the thrubolt 2, the head of which countersunk in the under side of block 5 and the shank of which passes up through the slot A-A in block 1 (Fig. 3). lWhen block 1 has been moved forward or backward to the proper position, it is firmly clamped in place by tightening the wing-nut 3, which rests on the washer et. To facilitate such sliding forward or backward of block 1, there is placed on the under side of block 1 a ratchet plate 18 (Fig. 3 and Fig. l). This ratchet plate 18 is to receive the teeth of the pinion 17 (Figs. 2, 5, 6, and 7). Piece number 7 serves the double purpose of pivot upon which block 5 may be tilted and also of a pinion crank for turning the pinion 17. The -said pinion 17 is located in a notch rabbeted out of the upper side of block 5, is firmly fastened to the pinion crank 7 by mea-ns of a set screw, and is so placed that the teeth of the pinion will be received by the ratchet plate 18. Thus when the pinion crank 7 is turned, block 1 will slide forward or backward to the desired position.

A metal bracket 19 is placed on each side of the grinding wheel close to the point of contact with the disk. The upper section ofl each of these two brackets 19, 19, is drilled and tapped to receive the guard screw 20, the shank of which extends out beyond the rim of the grinding wheel and, by pressing against the disk, prevents a deeper cut than might otherwise be made. The two guard screws 20, 20,. are .firmly fastened at the proper distances by means of a lock nut 21 on each.

.et metal trough 22. which riveted or bolted on to the guaiwfl bracket 19, receives the grindings and carries them over the side of the' baise plank 10".

The' device is operated in the'. following manner: The plow-disk is placed on the metal holder 27 with the edge against the grinding Wheel on u line horizontal with the center of the grinding Wheels sii-aft. This placing the edge of the disk on a line horizontal with the center of the grinding wheels shaft is done by raising or lowering the hinged block 9. 'The heel orf the disk is ground down until it comes close to the cutting edge-but not further. The thumb guard-serews' 20, 20 are set against the disk i on both sides of the grinding wheel and lurk nuts 2l, Qi are' tightened. `In this position the Erst round of grinding is completedl by revolving the disk. lfVhen this is completed, Without removing the dink, block i is elevated :e trifle if necessary, which is accomplished by loosening wing-nut 3 und turning *ehe pinion crank 7. Wing nut is retignterred and block 5I is tilted by turning the @mink shaft (i so that the grinding wheel will. out the heel of the new grinding. The disk is revolved as before. If a third gri-riding is desired, the disk may be reset in the' saine manner as for the second round ofi Grinding.

` fam aware that prior to my inventi'mi disk sfharpening machines have been made and' marketed; I therefore do not elnini I claim:

i.- A Woll; holder for cuuivtr (lieke while being ground, consisting of an upper block having a -pin capable of acting as u pivoi For the disk, ay buse, :L lower block pivoted to the base, :t middle block pivoted to tlul lower block und upon which the upper block is mounted to slide, and a guide bracket :und straps for holding the blocks in pluce.

2. A work holder for cultivntor disks while being ground, consisting of an upper bleek having a in capable of acting.' us a pivot for the i a bise, alower blork pivot'ed to the buse, av middle blmk pivoted to the lower block amd upon Willis-h the upper block is mounted to slide, and av guide bracket and straps for holding the' blocks in place, and means carried by the, middle block for-causing it to tilt on the lower block.

3. A work holder for cultivxtor disks while being ground, consisting of an upper block having a pin. capable of acting as n pivot for the disk, a buse, u lower blork pi'voted to the base, a middle block pivoteel to the lower block and upon which the upper block is mounted to slide, and is ruido bracket and straps for holding the bloeks in place, and means for causing the upper blovk to slide upon the middle block.

CARL T. GROVE.

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